Grodan Delta 4 Gro-Block w/Hole - Strip of 8

Achieve an optimum balance of oxygen to nutrients with Grodan Delta Gro-Blocks for rapid plant growth. A sustainable and environmentally friendly growing medium.

• Manufactured from rockwool substrate, these Gro-Blocks are completely sterile, lightweight and easy to use. Unique hydrophilic fiber makes crop production easy to control by allowing efficient use of water and nutrients.• Ideal for direct sowing of our Grodan A-OK Starter Plugs, sold separately. When seedling roots coming out of plugs are 1” long, simply place plug in Gro-Block hole.• Delta 4 Blocks are ideal for use with small plants, such as strawberries and peppers. Sold in strips of 8 blocks.• Delta 6 Blocks are great for growing large fruiting crops, such as tomatoes and cucumbers, in our HydroCycle Dutch Buckets, sold separately. Sold in strips of 6 blocks.• Perfect for use in ebb and flo, Dutch bucket and drip hydroponic systems.• Priced per strip.